13278869 has 2 divisors, whose sum is σ = 13278870. Its totient is φ = 13278868.

The previous prime is 13278851. The next prime is 13278871. The reversal of 13278869 is 96887231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10432900 + 2845969 = 3230^2 + 1687^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13278869 is a prime.

It is a super-2 number, since 2×13278869² = 352656723838322, which contains 22 as substring.

Together with 13278871, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13278899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6639434 + 6639435.

It is an arithmetic number, because the mean of its divisors is an integer number (6639435).

Almost surely, 2^13278869 is an apocalyptic number.

It is an amenable number.

13278869 is a deficient number, since it is larger than the sum of its proper divisors (1).

13278869 is an equidigital number, since it uses as much as digits as its factorization.

13278869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 44.

The square root of 13278869 is about 3644.0182491310. The cubic root of 13278869 is about 236.8029066347.

The spelling of 13278869 in words is "thirteen million, two hundred seventy-eight thousand, eight hundred sixty-nine".